The effect of nanostructure on the tensile modulus of carbon fibers

Nanoindentation derived elastic constants of carbon fibres and their nanostructural based predictions

“…Later on, it was generalized to take into account short fibres, more strengthening phases with different orientation distributions [27,28]. As carbon fibres have a similar complex composite structure at nano level [4,5], it was reasonable to adopt the EMT model for the description of their elastic behaviour [14,21].…”

“…In this work, several assumptions were made similar to recent micromechanical models reported earlier [14,21]. Firstly, the composition of carbon fibre is assumed to consist of three phases, crystalline carbon, amorphous matrix and microvoids.…”

“…These works include tensile tests combined with optical microscopy [10], laser diffraction [11,12], X-ray diffraction [12][13][14], micro-Raman spectroscopy [15] on single carbon fibres or bundles, and nanoindentation studies [15][16][17][18][19] on C-fibre reinforced composites. In order to predict the C-fibre elastic properties, several models have been developed and improved during the last couple of decades [10,12,14,20,21]. Lately, the most accurate studies use micromechanical models taking into account both crystalline, amorphous and void content of Cfibres [14,21] and molecular dynamics simulations [20].…”

“…In order to predict the C-fibre elastic properties, several models have been developed and improved during the last couple of decades [10,12,14,20,21]. Lately, the most accurate studies use micromechanical models taking into account both crystalline, amorphous and void content of Cfibres [14,21] and molecular dynamics simulations [20].…”

“…Even the simulation approach is also not sufficient. Recent micromechanical models [14,21] were developed to predict the Young's modulus of fibres and were not tested on the complete set of elastic constants.…”